ary-ptrn-elem-id-iter-val-err.js (1720B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-elem-id-iter-val-err.case 3 // - src/dstr-binding/error/let-stmt.template 4 /*--- 5 description: Error forwarding when IteratorValue returns an abrupt completion (`let` statement) 6 esid: sec-let-and-const-declarations-runtime-semantics-evaluation 7 features: [Symbol.iterator, destructuring-binding] 8 flags: [generated] 9 info: | 10 LexicalBinding : BindingPattern Initializer 11 12 1. Let rhs be the result of evaluating Initializer. 13 2. Let value be GetValue(rhs). 14 3. ReturnIfAbrupt(value). 15 4. Let env be the running execution context's LexicalEnvironment. 16 5. Return the result of performing BindingInitialization for BindingPattern 17 using value and env as the arguments. 18 19 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 20 21 SingleNameBinding : BindingIdentifier Initializeropt 22 23 [...] 24 4. If iteratorRecord.[[done]] is false, then 25 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 26 b. If next is an abrupt completion, set iteratorRecord.[[done]] to true. 27 c. ReturnIfAbrupt(next). 28 d. If next is false, set iteratorRecord.[[done]] to true. 29 e. Else, 30 i. Let v be IteratorValue(next). 31 ii. If v is an abrupt completion, set iteratorRecord.[[done]] to 32 true. 33 iii. ReturnIfAbrupt(v). 34 35 ---*/ 36 var poisonedValue = Object.defineProperty({}, 'value', { 37 get: function() { 38 throw new Test262Error(); 39 } 40 }); 41 var g = {}; 42 g[Symbol.iterator] = function() { 43 return { 44 next: function() { 45 return poisonedValue; 46 } 47 }; 48 }; 49 50 assert.throws(Test262Error, function() { 51 let [x] = g; 52 }); 53 54 reportCompare(0, 0);